Lock for elevator-doors.



No. 762,455. PATENTED JUNE 14, 1904. F. W. TOBEY.

LOOK FOR ELEVATOR DOORS.

APPLICATION IILED'JAN. 25,1904.

no MODEL.

UNITED STATES Patented June 14, 1904.

PATENT OFFICE.

FRED W. TOBEY, OF NORWOOD, OI IIO, ASSIGINOR TO THE CINCINNATI MANUFACTURING COMPANY, OF CINCINNATI, OHIO, A CORPORATION.

LOOK FOR ELEVATOR-DOORS.

SPECIFICATION forming part of Letters Patent No. 762,455, dated June 14, 1904.

Application filed January 25,1904. Sta No. 190,445. (Nomodeh) To all whom it may concern:

Be it known that I, FRED W. TOBEY, a citia to hold the door in any position in which it stops and which will be automatically released by the elevator-car.

Another object of my invention is to provide a lock which cannot be opened from the outside and preferably which is inaccessible even on the inside to the operator.

The results of my mechanism are that when the door is shut it will be automatically locked and then only released when the car is in juxtaposition to the door-opening, at which time the operator can freely open and close the door. After the car leaves the door of a 5 given floor it cannot be opened until it returns to that floor.

The features of my invention are more fully set forth in the description of the accompanying drawings, forming a part of this specifi- 3 cation, in which Figure 1 is an inside view of the'elevatordoor. Fig. 2 is a side view of the automatic trip, showing the relative position of the car. Fig. 3 is an outsideview of the top of the doorway. Fig. 4 is a top plan view of the locking-pawl and releasing-plate.

A represents the elevator-door; A, the panel for the elevator-opening; B, the side frame; C, the top horizontal guideway on which the door member A slides.

D represents a journal-bracket carrying the roller E, traveling upon the top of the way C.

F represents a section of the car. (See Fig. 2.)

Gr represents the top of the moving door member A. It is provided with the rack H, the teeth of which are inclined on one side in the direction in which the door moves when closing.

I represents a pawl pivoted on the way C, 5 the depending end of which engages the teeth of the rack H, so as to automatically be raised, allowing the door member A to be moved freely in the direction of. closing the door,

but which locks the door against movement in the direction of opening.

J represents a sliding plate provided with slots at a, engaging the bolts 6 b, secured into the way (1. This method of securing allows the plate J to be shifted in either direction parallel with the way C. Said plate has a front cam-shoulder K engaging under a pin L on the end of the pawl I. Obviously when this plate J is shifted toward the pawl I the shoulder K engaging under the pin L serves 5 to lift the pawl I from engagement with the teeth ll of the rack H.

M represents a tripping-lever intermediately fulcrumed at 0 to the side door-frame B. The top of said trip-lever M is pivoted at (Z 7 upon the sliding plate J.

e representsa coil-spring one end of which is secured to the sliding plate and the other end of which is secured to a boltf on the way 0.

N represents the floor, and the trip-lever M preferably extends downward to the floor and is provided with a cam-shaped tripping end 0. The car F is provided with a lug P, adapted to engage the end 0 and shift the lever M on its 30 fulcrum, thereby shifting the sliding plate J toward the pawl, releasing the same from the rack H. While the car is in position on a given floor the pawl I is held released and the door may be freely manipulated by the 5 operator. When the car leaves a floor, the lug P is disengaged from the tripping end 0 and the spring a returns the sliding plate J and the lever M to normal position, in which the pawl is in engagement withthe rack-teeth. 9

It is obvious that this look is operative along the entire path of the door movement, so that the door will lock in any position in which it is accidentally left.

Many accidents are occasioned by the fact that the attendant when starting the car gives the door a throw in the direction of closing. and it either does not slide far enough to engage the catch in the door-frame or it bounces back without engagement, leaving the door open and freely movable in its path of travel. Obviously with my mechanism this accident could not occur.

The rack is the preferred or specific form of theinvention; but genericall ya plate might be provided formed with any suitable locking-detents adapted to be engaged and disengaged with the depending end of the pawl in the manner and for the purposes described. Also the relative positions of the locking members might be reversed.

Having described my invention, I claim- 1. In combination with an elevator-doorwayframe and sliding door, of a rack mounted on top of the moving door, a pawl pivoted to the top frame, and having a depending end engaging the rack-teeth, the rack-teeth being inclined to allow the door to move in a direction of closing but to interlock the pawl and rack in the direction of opening, a shifting member having a horizontal guideway connection with the door-frame, the said shifting member and the said pawl having a cam and pin adapted to lift the pawl from the rack, and means for actuating the said shifting member to release the pawl, substantially as described.

2. In combination with an elevator-doorway frame and sliding door, of a rack mounted on top of the moving door, a pawl pivoted to the top frame, and having a depending end engaging the rack-teeth, the rack-teeth being inclined to allow the door to move in a direction of closing but to interlock the pawl and rack in the direction of opening, a shifting membefhaving a horizontal guideway connection with the said shifting member and the said pawl having a cam and pin adapted to lift the pawl from the rack, and means actuated by the car to operate said shifting member to release the pawl, substantially as described.

3. In combination with an elevator-door- Way frame and sliding door, of a rack mounted on top of the moving door, a pawl pivoted to the top frame, and havinga depending end engaging the rack-teeth, the rack-teeth being inclined to allow the door to move in a direction of closing but to interlock the pawl and rack in the direction of opening, a shifting member movably secured on the door-frame, the said shifting member and the said pawl having a cam and pin adapted to lift the pawl from the rack, and a lever fulcrumed to the door-frame and to the said shifting member, said lever havinga cam end interposed in the path of elevator-car travel, whereby the car trips said lever, and a spring to hold the said tripping mechanism normally in disengaged position, substantially as described.

4. In combination with an elevator-doorway frame and sliding door, of a rack mounted on top of the moving door, a pawl pivoted to the top frame, and having a depending end engaging the rack-teeth, the rack-teeth being inclined to allow the door to move in a direction of closing but to interlock the pawl and rack in the direction of opening, a shifting member movably secured on the door-frame, the said shifting member and the said pawl having a cam and pin adapted to lift the pawl from the rack, and a lever fulcrumed to the door-frame and to the said shifting member, said lever having a cam end interposed in the path of elevator-car travel, whereby the elevator-car trips said lever, and a spring to hold the said tripping mechanism normally in disengaged position, the car being provided with a projecting lug, adapted to engage and trip the end of said lever, substantially as described.

.. 5. In an elevator, a doorway-frame and door, a rack on the door having upwardlyprojecting inclined teeth, a pawl pivoted to the frame having one end depending in looking relation with the rack-teeth, a trip on the door- .frame adapted to engage under and lift said pawl from the rack, substantially as described.

6. In an elevator, at doorway-frame and door, a rack on the door having upwardlyprojecting ineli ned teeth, a pawl pivoted to the doorway-frame having one end depending in locking relation with the rack-teeth, a trip having a horizontal guideway connection with the frame, said trip being adapted to engage A under and lift the pawl from the rack-teeth, a lever pivoted to the frame engaging the trip for sliding the same, said lever having an end projected in the path of elevator-car travel and means on the car for engaging the lever, substantially as described.

In testimony whereof I have hereunto set my hand.

FRED W. TOBEY.

itncsses:

OLIVER B. KAIsER, LUISE Been. 

